First of all, considering you’ve been away for so long, here’s some basics:
The game has changed drastically over the years.
Marauder DH is sort of minion build with an active playstyle:
https://d3.maxroll.gg/guides/marauder-sentry-demon-hunter-guide
Sentries are from the gameplay mechanics standpoint considered as “pets”.
Rathma Necro a sort of minion build but your main tool is to nuke groups of enemies the Army of the Dead:
https://d3.maxroll.gg/guides/rathma-army-of-the-dead-necromancer-guide
Minions are there just to buff you.
Overall Maxroll the best source of comprehensive build guides, gameplay mechanics info and other resources:
https://d3.maxroll.gg/